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Cr(VI) Adsorption to Magnetic Iron Oxide Nanoparticle‐Multi‐Walled Carbon Nanotube Adsorbents
The aim of this study was to investigate the Cr(VI) adsorption to magnetic iron oxide(MIO) nanoparticle‐ multi‐walled carbon nanotubes (MWCNTs) in aqueous solutions using batch experiments. Results show that the maximum adsorption capacity of Cr(VI) to MIO‐MWCNTs was 11.256 mg/g. Kinetic model analysis demonstrates that the pseudo‐second‐order model and Elovich model are suitable for describing the kinetic data. Thermodynamic analysis indicates that Cr(VI) adsorption to MIO‐MWCNTs decreased with increasing temperature from 5–60 °C, indicating the spontaneous and exothermic nature of the sorption process. Equilibrium isotherm analysis demonstrates that the Redlich‐Peterson model suitably describes the equilibrium data. In the pH experiments, Cr(VI) adsorption to MIO‐MWCNTs decreased gradually from 5.70–2.13 mg/g with increasing pH from 3.0–7.3. Sequential extraction indicates that, among the five binding forms of Cr(VI) associated with MIO‐MWCNTs, the predominant contributions are the fraction bound to Fe‐Mn oxides (57.82%) and the residual (23.38%).
Cr(VI) Adsorption to Magnetic Iron Oxide Nanoparticle‐Multi‐Walled Carbon Nanotube Adsorbents
The aim of this study was to investigate the Cr(VI) adsorption to magnetic iron oxide(MIO) nanoparticle‐ multi‐walled carbon nanotubes (MWCNTs) in aqueous solutions using batch experiments. Results show that the maximum adsorption capacity of Cr(VI) to MIO‐MWCNTs was 11.256 mg/g. Kinetic model analysis demonstrates that the pseudo‐second‐order model and Elovich model are suitable for describing the kinetic data. Thermodynamic analysis indicates that Cr(VI) adsorption to MIO‐MWCNTs decreased with increasing temperature from 5–60 °C, indicating the spontaneous and exothermic nature of the sorption process. Equilibrium isotherm analysis demonstrates that the Redlich‐Peterson model suitably describes the equilibrium data. In the pH experiments, Cr(VI) adsorption to MIO‐MWCNTs decreased gradually from 5.70–2.13 mg/g with increasing pH from 3.0–7.3. Sequential extraction indicates that, among the five binding forms of Cr(VI) associated with MIO‐MWCNTs, the predominant contributions are the fraction bound to Fe‐Mn oxides (57.82%) and the residual (23.38%).
Cr(VI) Adsorption to Magnetic Iron Oxide Nanoparticle‐Multi‐Walled Carbon Nanotube Adsorbents
Lee, Chang‐Gu (Autor:in) / Kim, Song‐Bae (Autor:in)
Water Environment Research ; 88 ; 2111-2120
01.11.2016
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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